EPRI CHAPTER 5 Flashcards
WHAT IS THE MVAR PRODUCTION OF A 50 MVAR SHUNT CAPACITOR THAT IS ENERGIZED AT 90% OF ITS NOMINAL VOLTAGE?
40.5
A 5% CHANGE IN VOLTAGE WILL TYPICALLY LEAD TO WHAT WHAT CHANGE IN THE TOTAL LOAD MAGNITUDE?
3%
A TRANSFORMER CAN BE OVEREXCITED IF EXPOSED TO
ALL OF THE ABOVE
WHAT IS THE APPROXIMATE MVAR/MILE PRODUCTION FOR A 345KV OVERHEAD LINE
3/4
A 345KV TRANSMISSION LINE OPERATES AT VARIOUS VOLTAGE LEVELS THROUGHOUT THE DAY. AT WHICH VOLTAGE LEVEL WILL THE TRANSMISSION LINE PRODUCE MORE REACTIVE POWER
360KV
A TRANSMISSION LINE HAS 50 OHMS OF INDUCTIVE REACTANCE. 25OHMS OF SERIES CAPACITORS ARE INSERTED IN THE LINE. WHAT IS THE LINE’S % SERIES COMPENSATION
50%
A TRANSMISSION LINE’S ________ IS THE MW LOADING AT WHICH THE MVAR FROM THE LINE’S NATURAL CAPACITANCE IS EQUAL TO THE MVAR THE LINE NEEDS TO SUPPORT ITS VOLTAGE
SURGE IMPEDANCE LOADING
WHAT IS THE APPROXIMATE MVAR/MILE PRODUCTION FOR A 500KV OVERHEAD LINE
2.0
GIVEN A PURELY INDUCTIVE LOAD WHAT CAN BE SAID ABOUT THE MVA THIS LOAD DRAWS FROM THE POWER SYSTEM?
THE LOAD DRAWS ONLY MVAR
A GENERATOR WITH SPARE MVAR IS ALWAYS A SOURCE OF DYNAMIC REACTIVE RESERVE
FALSE
THE 2 TYPES OF POWER PRODUCED BY THE SYSTEM GENERATORS ARE ACTIVE(MW) AND REACTIVE(MVAR)
TRUE
SOME COMMON CAUSES OF LOW VOLTAGE COULD BE
ALL OF THE ABOVE
GENERATORS ARE THE PRIMARY MEANS OF CONTROLLING POWER SYSTEM VOLTAGES
TRUE
EXCESSIVELY HIGH VOLTAGES ON THE POWER SYSTEM ARE LESS DANGEROUS THAT LOW VOLTAGES
FALSE
THERE ARE 3 GENERAL FRAMES FOR OVER VOLTAGES
LONG TERM/SHORT TERM/TRANSIENT
